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ADT7473
must be reprogrammed in twos complement. If a twos
complement temperature below ? 63 ? C is entered, the
temperature is clamped to ? 63 ? C. In this mode, the diode
fault condition remains ? 128 ? C = 1000 0000, while in the
extended temperature range ( ? 64 ? C to +191 ? C), the fault
condition is represented by ? 64 ? C = 0000 0000.
Additional ADC Functions for Temperature
Measurement
A number of other functions are available on the
ADT7473/ADT7473 ? 1 to offer the system designer
increased flexibility.
Turn-off Averaging
Table 17. TEMPERATURE MEASUREMENT
REGISTERS
Register Description
0x25 Remote 1 Temperature
Default
?
For each temperature measurement read from a value
register, 16 readings have actually been made internally and
the results averaged before being placed into the value
register. Sometimes it is necessary to take a very fast
measurement. Setting Bit 4 of Configuration Register 2
0x26
0x27
0x77
Local Temperature
Remote 2 Temperature
Extended Resolution 2
?
?
0x00
(0x73) turns averaging off.
Table 20. CONVERSION TIME WITH AVERAGING
DISABLED
Table 18. EXTENDED RESOLUTION TEMPERATURE
MEASUREMENT REGISTER BITS
Channel
Voltage Channel
Measurement Time (ms)
0.7
Bit
<7:6>
<5:4>
Mnemonic
TDM2
LTMP
Description
Remote 2 Temperature LSBs
Local Temperature LSBs
Remote 1 Temperature
Remote 2 Temperature
Local Temperature
7
7
1.3
<3:2>
TDM1
Remote 1 Temperature LSBs
Table 21. CONVERSION TIME WITH AVERAGING
Temperature Measurement Limit Registers
ENABLED
Associated with each temperature measurement channel
are high and low limit registers. Exceeding the programmed
high or low limit causes the appropriate status bit to be set.
Exceeding either limit can also generate SMBALERT
interrupts.
Channel
Voltage Channel
Remote Temperature
Local Temperature
Measurement Time (ms)
11
39
12
Table 19. TEMPERATURE MEASUREMENT LIMIT
REGISTERS
Register Description Default
Single-channel ADC Conversions
Setting Bit 6 of Configuration Register 2 (0x73) places
the ADT7473/ADT7473 ? 1 into single-channel ADC
conversion mode. In this mode, the ADT7473/ADT7473 ? 1
0x4E
0x4F
0x50
0x51
0x52
Remote 1 Temperature Low Limit
Remote 1 Temperature High Limit
Local Temperature Low Limit
Local Temperature High Limit
Remote 2 Temperature Low Limit
0x01
0x7F
0x01
0x7F
0x01
can be made to read a single temperature channel only. The
appropriate ADC channel is selected by writing to Bits
<7:5> of the TACH1 minimum high byte register (0x55).
Table 22. PROGRAMMING SINGLE-CHANNEL ADC
MODE FOR TEMPERATURES
0x53
Remote 2 Temperature High Limit
0x7F
Channel Selected
Bits <7:4>, Register 0x55
Reading Temperature from the ADT7473/ADT7473 ? 1
It is important to note that the temperature can be read
101
110
Remote 1 Temperature
Local Temperature
from the ADT7473/ADT7473 ? 1 as an 8-bit value (with 1 ? C
resolution) or as a 10-bit value (with 0.25 ? C resolution). If
only 1 ? C resolution is required, the temperature readings
can be read back at any time and in no particular order.
If the 10-bit measurement is required, a 2-register read for
each measurement is used. The extended resolution register
(Register 0x77) should be read first. This causes all
temperature reading registers to be frozen until all
temperature reading registers have been read from. This
prevents an MSB reading from being updated while its two
LSBs are being read, and vice versa.
111 Remote 2 Temperature
Configuration Register 2 (0x73)
Bit < 4 > = 1, Averaging Off.
Bit <6 > = 1, Single-channel Convert Mode.
TACH1 Minimum High Byte Register (0x55)
Bits <7:5> select the ADC channel for single-channel
convert mode.
Overtemperature Events
Overtemperature events on any of the temperature
channels can be detected and dealt with automatically in
http://onsemi.com
18
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